我只是想从服务器下载 mp4 或 .3gp 文件到 Android 设备。我尝试了多种方法来实现，但在某些情况下它会给出IOException，有时会给出 ProtocolException
使用 DownloadVideoTask.class 下载视频的第一种方法
public class DownloadVideoTask extends AsyncTask<String, Integer, Boolean>
{
String nameOfSong;
Context context;
Boolean flage = true;
ProgressDialog progressDialog2;
@SuppressLint("InlinedApi")
public DownloadVideoTask(Context context,String trackTitle)
{
this.context = context;
nameOfSong = trackTitle;
}
@Override
protected void onPreExecute()
{
super.onPreExecute();
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
{
progressDialog2 = new ProgressDialog(context, AlertDialog.THEME_HOLO_LIGHT);
}
else
{
progressDialog2 = new ProgressDialog(context);
}
progressDialog2.setIndeterminate(false);
progressDialog2.setMax(100);
progressDialog2.setTitle("Please wait...");
try
{
progressDialog2.setMessage("Downloding.. " + nameOfSong.substring(0, 20));
}
catch (Exception e)
{
progressDialog2.setMessage("Downloding Song...." );
}
progressDialog2.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog2.show();
}
@Override
protected Boolean doInBackground(String... params)
{
/* String trackTitle = params[0];
nameOfSong = trackTitle;
*/
String trackUrl = params[0];
try
{
File root;// = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
if(Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)
{
root = Environment.getExternalStorageDirectory();
}
else
{
root = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS);
}
File dir = new File(root.getAbsolutePath() + "/XarDownloder");
if (dir.exists() == false)
{
dir.mkdirs();
}
URL url = new URL(trackUrl);
File file = new File(dir, nameOfSong);
URLConnection urlConnection = url.openConnection();
int fileLength = urlConnection.getContentLength();//ye statement inputStream k bad likhi thi
InputStream inputStream = urlConnection.getInputStream();
OutputStream outputStream = new FileOutputStream(
root.getAbsolutePath() + "/XarDownloder/" + nameOfSong
+ ".mp4");
byte data[] = new byte[1024];
long total = 0;
int count;
while ((count = inputStream.read(data)) != -1)
{
total += count;
// publishing the progress....
publishProgress((int) (total * 100 / fileLength));
outputStream.write(data, 0, count);
}
outputStream.flush();
outputStream.close();
inputStream.close();
try
{
if(Build.VERSION.SDK_INT < Build.VERSION_CODES.HONEYCOMB)
{
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://"+ Environment.getExternalStorageDirectory())));
}
else
{
context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_MOUNTED,Uri.parse("file://" + Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC))));
}
context.sendBroadcast(new Intent(
Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri
.fromFile(file)));
}
catch (Exception e)
{
}
return true;
}
catch (IOException e)
{
flage = false;
e.printStackTrace();
}
return false;
}
@Override
protected void onPostExecute(Boolean result)
{
super.onPostExecute(result);
if (result)
{
try
{
Toast.makeText(context,
nameOfSong.substring(0, 30) + "Downloaded...",
Toast.LENGTH_LONG).show();
}
catch (Exception e)
{
Toast.makeText(context,
"Song Downloaded...",
Toast.LENGTH_LONG).show();
}
}
else
{
Toast.makeText(context, "Sorry, song is not downloadable",
Toast.LENGTH_LONG).show();
}
progressDialog2.dismiss();
}
@Override
protected void onProgressUpdate(Integer... values)
{
super.onProgressUpdate(values);
progressDialog2.setProgress(values[0]);
}
}
使用 DownloadFile 的第二种方法
public class DownloadFile extends AsyncTask<String, Integer, String>
{
String videoToDownload = "http://r2---sn-u2oxu-f5f6.googlevideo.com/videoplayback?expire=1438261718&fexp=901816,9405637,9407538,9407942,9408513,9408710,9409172,9413020,9414764,9414856,9414935,9415365,9415485,9416126,9416355,9417009,9417719,9418201,9418204&id=d813f7f3bef428da&mn=sn-u2oxu-f5f6&mm=31&mime=video/mp4&upn=82UaibRK7EM&itag=18&pl=24&dur=148.189&ip=167.114.5.145&key=yt5&ms=au&mt=1438239687&mv=u&source=youtube&ipbits=0&pcm2cms=yes&sparams=dur,id,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,pcm2cms,pl,ratebypass,source,upn,expire&lmt=1428049239028653&signature=39087CBD9BDC9EBD612CA0E8E82AC692B427FFE3.18C23CD0AEC8410CFBE4F35F532199DFF21E7DFA&ratebypass=yes&sver=3&signature=&title=How+To+Train+Your+Dragon+2+Official+Trailer+%231+%282014%29+-+Animation+Sequel+HD&filename=How_To_Train_Your_Dragon_2_Official_Trailer_1_2014__Animation_Sequel_HD.mp4";
public DownloadFile()
{
}
@Override
protected String doInBackground(String... params)
{
int count;
try
{
mp4load(videoToDownload);
}
catch (Exception e)
{
// TODO: handle exception
}
/*try
{
URL url = new URL(videoToDownload);
URLConnection conexion = url.openConnection();
conexion.connect();
// this will be useful so that you can show a tipical 0-100%
// progress bar
int lenghtOfFile = conexion.getContentLength();
// downlod the file
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream("/sdcard/xarwere/firstdownload.mp4");
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1)
{
total += count;
// publishing the progress....
publishProgress((int) (total * 100 / lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
}
catch (Exception e)
{
e.printStackTrace();
}*/
return null;
}
public void mp4load(String urling)
{
try
{
URL url = new URL(urling);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
//c.setDoOutput(true);
con.connect();
String PATH = Environment.getExternalStorageDirectory()
+ "/download/";
//Log.v(LOG_TAG, "PATH: " + PATH);
File file = new File(PATH);
file.mkdirs();
String fileName = "test.mp4";
File outputFile = new File(file, fileName);
if (!outputFile.exists())
{
outputFile.createNewFile();
}
FileOutputStream fos = new FileOutputStream(outputFile);
int status = con.getResponseCode();//my doctory
InputStream is = con.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
fos.write(buffer, 0, len1);
}
fos.close();
is.close();
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (ProtocolException e)
{
e.printStackTrace();
}
catch (IOException e1)
{
e1.printStackTrace();
}
}
}
Where videoToDownload in DownloadFile.class is the URLi want to download. but at inputStream it gives exception.
我称这些为 AsyncTask
new DownloadFile().execute();
new DownloadVideoTask(TestingActivity.this, "nameofsong").execute("http://r2---sn-u2oxu-f5f6.googlevideo.com/videoplayback?expire=1438261718&fexp=901816,9405637,9407538,9407942,9408513,9408710,9409172,9413020,9414764,9414856,9414935,9415365,9415485,9416126,9416355,9417009,9417719,9418201,9418204&id=d813f7f3bef428da&mn=sn-u2oxu-f5f6&mm=31&mime=video/mp4&upn=82UaibRK7EM&itag=18&pl=24&dur=148.189&ip=167.114.5.145&key=yt5&ms=au&mt=1438239687&mv=u&source=youtube&ipbits=0&pcm2cms=yes&sparams=dur,id,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,pcm2cms,pl,ratebypass,source,upn,expire&lmt=1428049239028653&signature=39087CBD9BDC9EBD612CA0E8E82AC692B427FFE3.18C23CD0AEC8410CFBE4F35F532199DFF21E7DFA&ratebypass=yes&sver=3&signature=&title=How+To+Train+Your+Dragon+2+Official+Trailer+%231+%282014%29+-+Animation+Sequel+HD&filename=How_To_Train_Your_Dragon_2_Official_Trailer_1_2014__Animation_Sequel_HD.mp4");
最佳答案
我稍微修改了你的代码，但它可以很好地下载文件。您添加了互联网权限吗？
public class DownloadFile extends AsyncTask<String, Integer, String> {
String videoToDownload = "http://r2---sn-u2oxu-f5f6.googlevideo.com/videoplayback?expire=1438261718&fexp=901816,9405637,9407538,9407942,9408513,9408710,9409172,9413020,9414764,9414856,9414935,9415365,9415485,9416126,9416355,9417009,9417719,9418201,9418204&id=d813f7f3bef428da&mn=sn-u2oxu-f5f6&mm=31&mime=video/mp4&upn=82UaibRK7EM&itag=18&pl=24&dur=148.189&ip=167.114.5.145&key=yt5&ms=au&mt=1438239687&mv=u&source=youtube&ipbits=0&pcm2cms=yes&sparams=dur,id,ip,ipbits,itag,lmt,mime,mm,mn,ms,mv,pcm2cms,pl,ratebypass,source,upn,expire&lmt=1428049239028653&signature=39087CBD9BDC9EBD612CA0E8E82AC692B427FFE3.18C23CD0AEC8410CFBE4F35F532199DFF21E7DFA&ratebypass=yes&sver=3&signature=&title=How+To+Train+Your+Dragon+2+Official+Trailer+%231+%282014%29+-+Animation+Sequel+HD&filename=How_To_Train_Your_Dragon_2_Official_Trailer_1_2014__Animation_Sequel_HD.mp4";
@Override
protected String doInBackground(String... params) {
int count;
try {
mp4load(videoToDownload);
} catch (Exception e) {
// TODO: handle exception
}
return null;
}
public void mp4load(String urling) {
try {
URL url = new URL(urling);
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");
//c.setDoOutput(true);
con.connect();
String downloadsPath = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS).getAbsolutePath();
String fileName = "test.mp4";
File outputFile = new File(downloadsPath, fileName);
if (!outputFile.exists()) {
outputFile.createNewFile();
}
FileOutputStream fos = new FileOutputStream(outputFile);
int status = con.getResponseCode();
InputStream is = con.getInputStream();
byte[] buffer = new byte[1024];
int len1 = 0;
while ((len1 = is.read(buffer)) != -1) {
fos.write(buffer, 0, len1);
}
fos.close();
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
关于java - 从服务器下载mp4并将其保存到sd卡，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31718850/